EP1547889A1 - Servomoteur pneumatique pour systeme de freinage de vehicule automobile et systeme de freinage comportant un tel servomoteur - Google Patents
Servomoteur pneumatique pour systeme de freinage de vehicule automobile et systeme de freinage comportant un tel servomoteur Download PDFInfo
- Publication number
- EP1547889A1 EP1547889A1 EP04029433A EP04029433A EP1547889A1 EP 1547889 A1 EP1547889 A1 EP 1547889A1 EP 04029433 A EP04029433 A EP 04029433A EP 04029433 A EP04029433 A EP 04029433A EP 1547889 A1 EP1547889 A1 EP 1547889A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reinforcement
- face
- wall
- housing
- flat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
- B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements
Definitions
- the subject of the present invention is a pneumatic servomotor for motor vehicle braking system. It aims a montage of a master cylinder on a servomotor. In particular, it aims to allow to have a reinforcement of fixing screw of the master cylinder to servomotor in a position always good.
- the aim of the invention is to optimize the role of the reinforcement by ensuring a preferred position of said reinforcement.
- a pneumatic brake booster generally a housing with a sheet metal wall, containing a chamber variable volume front, separate from a rear chamber, also variable volume by a partition formed by a waterproof membrane and flexible and a rigid skirt plate.
- the rigid skirt drives a piston tire bearing, via a push rod, on a primary piston of a master cylinder of a hydraulic braking circuit, typically a master cylinder.
- the master cylinder penetrates so partially, by means of a penetrating nose, into the front chamber of the servomotor.
- the front chamber placed on the side of the master cylinder, is connected pneumatically to a vacuum source.
- the back bedroom opposite the front chamber and placed on the side of a brake pedal, is connected pneumatically, in a controlled manner by a valve to a source of propellant fluid.
- the front and rear chambers are connected between they, while the rear chamber is insulated from the pressure atmospheric.
- When braking first isolate the front chamber by relative to the rear chamber, then air is admitted into the rear chamber. This air intake has the effect of propelling the partition.
- the 'rigid skirt then drives the pneumatic piston, which itself drives the piston primary cylinder master by means of a push rod.
- the fixing zone, on the wall of the housing, is subjected to numerous constraints, because of the high values of the efforts, even the rapid variations in values of these efforts.
- the wall of the housing must be able to bear them without breaking. While being rigid, he must also have some flexibility.
- the housing has a generally cylindrical shape. It is closed to its ends respectively by a cover, and by a bottom.
- the bottom is provided an orifice to let the master cylinder pass.
- the bottom has a face plane connected to an inclined face.
- the inclined face extends from the edge of the face plane to a cylindrical edge of the housing.
- the flat face of the bottom of the case had a general shape circular. It was then demonstrated that a planar face having a shape diamond pattern gave better results in terms of compromise flexibility and rigidity of the wall, in particular because of better distribution of constraints.
- Boosters of servomotor manufactured currently therefore usually have a flat face of the wall of form circular or diamond shaped.
- a reinforcement is provided between the screw head and the sheet metal wall of the housing of the servomotor. This reinforcement must allow the bottom wall of the case better resist the constraints. The reinforcement must therefore prevent fatigue of the sheet of the wall due to repeated braking.
- reinforcements whose contour, at the base of the reinforcement, is provided with two cut sections forming an angle, and interconnected by a rounding.
- the surface circumscribed by this contour is flat.
- Another surface defined by the rounding is inclined.
- the slope break of the reinforcement, between the plane face and the inclined face corresponds to the slope break of the wall of the housing.
- a screw hole is provided in the reinforcement, at its flat face.
- At least one form is used, preferably stamped, disposed on the flat inner face of the housing wall. This shape allows to wedge the reinforcement correctly on the wall of the housing and to prevent any movement of the reinforcement relative to its preferred position when tightening the screw.
- the guiding means may be formed by at least one cleat.
- the cleat follows, for example, an outline of the reinforcement.
- the subject of the invention is also a braking system provided with a such servomotor.
- Figure 1 shows a pneumatic servomotor for motor vehicle braking, comprising a housing 1 in which is partially introduced a master cylinder 7.
- the housing 1 has a front chamber 2 and a rear chamber 3, separated by a membrane 4.
- the housing 1 is of cylindrical general shape. Said housing 1 is closed to its two ends, respectively by a cover and a bottom 9.
- the wall or bottom 9 is convex.
- Fixing means 5 fixes the master cylinder 7 to servomotor.
- the fixing means is for example a screw 5.
- the screw 5 crosses the bottom 9 of the housing 1, and a flange 6 of the master cylinder 7.
- the flange 6 is contiguous against an outer face of the bottom 9.
- the inner face of the bottom 9 comprises means 10 for maintaining a piston return spring of the servomotor. As shown in FIG. 1, this means 10 surrounds an orifice accommodating the master cylinder 7. Of course we understand this figure that a screw reinforcement 15 must have a particular shape so that it. do not overlap means 10.
- Figures 2 and 3 show an inner face of the wall 9 housing 1 servomotor as currently used.
- Said inner face is provided with an inclined face 11 and a flat face 12 in polygonal shape.
- the shape of the reinforcement 15 must also take into account the shape of the wall 9.
- the flat face 12 may have another form. For example, it may have a generally circular shape.
- a main orifice 13 In the center of the flat internal face 12 is formed a main orifice 13 to let through a penetration nose of master cylinder 7 when the servomotor is assembled to the master cylinder. Also represented two secondary orifices 4 in which pass fastening screws 5 (Figure 1) from the master cylinder to the housing.
- the polygonal shape 12 is approximately one diamond. By approximately a rhombus one understands that the form polygonal is provided with four sides, an angle between two adjacent sides being strictly less than or strictly greater than 90 °. The angles formed can be pointed or rounded.
- the two screw holes 14 are located at vertices furthest away from said rhombus.
- the reinforcement 15 has a shape allowing good positioning by ratio by means of 10 and the plane and inclined faces 11 of the wall 9.
- a first frustoconical portion D of the reinforcement 15 is in contact with the face 11.
- a second flat part E, towards the top of the cone, is to it in contact with the flat face 12 ( Figure 6).
- the reinforcement 15 is provided with a orifice 17, through which the body of the screw 5 passes.
- the reinforcement 15 is offset with respect to an axis 16 passing through the centers respectively of the orifice 13 and secondary ports 14.
- the reinforcement 15 has an outline cut. An angle is formed by two cut faces A and A '. A third side B connects the two cut sections. Side B is rounded.
- the reinforcement 15 has a profile with a slope break C between the frustoconical part D and the part In general, the slope break C has an angle 18 greater than 90 °.
- the first portion D of said reinforcement 15 bears against one face 11 of the wall 9.
- the second part E bears against a flat face 12 of said wall 9 connected to the inclined face 11 at the location of this rupture slope C ( Figures 2, 3 and 6).
- the angle formed by the cut edges A and A 'of the reinforcement 15 is such that the axis 16 passes through the tip of this angle, as this is shown in Figure 2.
- the contact areas between the reinforcement 15 and the wall 9 coincide exactly.
- FIG. 3 shows, on the other hand, the reinforcement 15 badly positioned.
- the angle formed by the cut edges A and A ' is slightly offset relative to the axis 16.
- the part E of the reinforcement 15 then partially rises on the inclined face 11 of the wall 9.
- the slope of the reinforcement 15 being substantially the same over its entire surface and being equal to the slope of the inclined face 11 of the wall 9, it is clear that the contacts will not be more sufficient to allow the reinforcement 15 to properly rigidify the area of the wall 9 where the constraints are mainly exercised.
- This bad positioning of the reinforcement 15 can have several causes. It can result from a bad starting position, like a rotation reinforcement 15 with respect to its initial position when tightening the screw 5.
- the present invention therefore provides a guide means 19 for prevent the reinforcement 15 from moving when tightening screws 5, or from being badly positioned from the start.
- the guiding means 19 is in relief with respect to the flat internal face 12.
- FIGS. 4a and 5 show a particular example of embodiment of the invention.
- the reinforcement 15 is held in the correct position on the wall by via two cleats 19 bearing against the two sides cut A and A 'of the reinforcement 15.
- the guiding means 19 can also, by example, be a boss.
- cleats 19 are for example obtained by printing an impact located on the flat outer face 12 of the wall. They are then part integral of the wall. Such cleats 19 can also be obtained by molding on the flat internal face 12 of the wall 9, or by gluing the cleats 19 on the flat internal face 12.
- the cleats 19, as shown in FIGS. 4a and 5, are elongated, bean-shaped. They are arranged on the flat internal face 12 so as to form an angle whose tip is directed towards the main orifice 13. The angle formed by these cleats 19 is equal to that formed by the two cut sides A and A 'of the reinforcement 15.
- the cleats 19 have a height relative to the flat face 12 sufficient to hold the reinforcement 15 in place, without weakening said flat face 12. For example, for a 300mm servomotor of diameter, and a flat face 12 of 100mm, the cleats 19 have a height approximately equal to 2mm.
- FIG. 4b illustrates another form of cleat 19.
- a single cleat 19 is located on the face internal plane 12 of the wall 9 of the housing. The cleat is curved, so as to follow the contour in cut edges A, A 'of the reinforcement 15.
- the example described above is based on a plane flat face approximately in rhombus. It goes without saying that the polygonal shape of the flat face can be different.
- the polygonal shape can for example be approximately a triangle.
- a screw can then be affixed to one, two or three of the vertices of said triangle.
- Cleats are arranged at the corners of the triangle provided with a screw hole 14, in the same way as for a face flat diamond.
- the shape of the flat face may not be polygonal. By for example, it may have a generally circular shape. Screw reinforcements are, for example, arranged on either side of a diameter of the disk.
- the flat face may also have a generally oval shape. We place then, for example, screws and screw reinforcements in the circumference of the oval shape, at points furthest away from each other.
- the reinforcement may for example have three cut sides. It can also have a general square shape.
- the square reinforcement can be provided with two cut corners forming an angle, and two other rounded sides.
- the reinforcement square can still be provided with four cut sides forming four angles.
- Such a square reinforcement also eliminates the problem of orientation of the reinforcement during positioning. Indeed, all cut sides form angles likely to be held by the cleats.
- he is also possible to have a reinforcement in the shape of a half circle. The rounded side of the half circle is for example directed towards the main orifice. Guiding means perhaps identical to a guide means for a circular reinforcement.
- the invention also relates to a braking system comprising such a servomotor.
- a braking system is for example provided with a control member actuated by a driver when he wishes to brake.
- the control rod in turn actuates a push rod pushing a rigid skirt of a booster of the invention.
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
Abstract
Description
- une face plane, qui sera en contact avec la face plane de la paroi,
- une face inclinée, qui sera, au moins partiellement, en contact avec la face inclinée de la paroi.
- un boítier pneumatique ayant une paroi munie d'une face interne plane, cette face interne plane étant munie d'un orifice principal pour accueillir un nez de pénétration d'un maítre cylindre,
- un moyen de fixation du maítre cylindre au boítier, le moyen de fixation passant dans l'orifice secondaire,
- un renfort disposé sur la face interne plane de la paroi du boítier, muni d'un orifice pour laisser passer le moyen de fixation,
la face interne plane de la paroi est munie d'un moyen de guidage pour venir en appui contre un contour du renfort.
- Figure 1 : vue générale d'un servomoteur pneumatique pour système de freinage de véhicule automobile de l'état de la technique ;
- Figure 2 : vue générale d'une face interne d'une paroi de boítier pneumatique et de renforts de l'état de la technique correctement positionnés;
- Figure 3 : vue générale d'une face interne d'une paroi de boítier pneumatique et de renforts de l'état de la technique mal positionnés ;
- Figure 4a : vue générale d'une face interne d'une paroi de boítier pneumatique munie d'un moyen de guidage selon un exemple de réalisation de l'invention ;
- Figure 4b : vue générale d'une face interne d'une paroi de boítier pneumatique munie d'un moyen de guidage selon un autre exemple de réalisation de l'invention ;
- Figure 5 : agrandissement d'une face interne d'une paroi et des taquets selon l'invention ;
- Figure 6 : agrandissement d'un renfort de l'état de la technique.
Claims (12)
- Servomoteur pneumatique pour un système de freinage de véhicule automobile comprenantun boítier (1) pneumatique ayant une paroi (9) munie d'une face interne plane (12), cette face interne plane étant munie d'un orifice principal (13) pour accueillir un nez de pénétration d'un maítre cylindre (7),un moyen de fixation (5) du maítre cylindre au boítier, le moyen de fixation passant dans un orifice secondaire (14),un renfort (15) disposé sur la face interne plane de la paroi du boítier, muni d'un orifice (17) pour laisser passer le moyen de fixation,
- Servomoteur selon la revendication 1, caractérisé en ce que le moyen de guidage est formé par au moins un taquet (19).
- Servomoteur selon l'une des revendications 1 à 3, caractérisé en ce que le renfort a un contour en pans coupés (A, A').
- Servomoteur selon la revendication 3, caractérisé en ce que deux taquets (19) sont allongés et sont disposés de manière à former un angle dont la pointe est dirigée vers l'orifice principal, ledit angle étant égal à celui formé par deux pans coupés (A, A') du renfort.
- Servomoteur selon la revendication 4, caractérisé en ce que le renfort possède un troisième côté (B) reliant les deux pans coupés ce troisième côté étant arrondi.
- Servomoteur selon l'une des revendications 1 à 5, caractérisé en ce que le renfort possède un profil avec une rupture de pente (C) entre une première partie (D) tronconique et une deuxième partie (E) plane vers le sommet du cône, la première partie étant destinée à porter contre une face inclinée (11) de la paroi, la deuxième partie étant destinée à porter contre la face plane de la paroi raccordée à la face inclinée à l'endroit de cette rupture de pente.
- Servomoteur selon l'une des revendications 1 à 6, caractérisé en ce que le renfort a une pente sensiblement égale sur toute sa surface et au plus égale à celle de la paroi inclinée du boítier.
- Servomoteur selon l'une des revendications 1 à 7, caractérisé en ce que la face plane (12) a une forme polygonale.
- Servomoteur selon la revendication 8, caractérisé en ce que la forme polygonale est approximativement en losange.
- Servomoteur selon l'une des revendications 8 et 9, caractérisé en ce qu'il comporte une vis à des sommets opposés du polygone.
- Servomoteur selon l'une des revendications 1 à 10, caractérisé en ce que le moyen de fixation est un moyen vis (5) écrou (8), la vis passant par l'orifice ménagé sur le renfort et un orifice secondaire (4) ménagé sur la face interne plane du boítier.
- Système de freinage de véhicule automobile muni d'un servomoteur selon les revendications 1 à 11, et d'un maítre cylindre (7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0315505A FR2864500A1 (fr) | 2003-12-24 | 2003-12-24 | Servomoteur pneumatique pour systeme de freinage de vehicule automobile et systeme de freinage comportant un tel servomoteur |
FR0315505 | 2003-12-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1547889A1 true EP1547889A1 (fr) | 2005-06-29 |
EP1547889B1 EP1547889B1 (fr) | 2007-03-07 |
Family
ID=34531365
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04029433A Not-in-force EP1547889B1 (fr) | 2003-12-24 | 2004-12-13 | Servomoteur pneumatique pour systeme de freinage de vehicule automobile et systeme de freinage comportant un tel servomoteur |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1547889B1 (fr) |
AT (1) | ATE356012T1 (fr) |
DE (1) | DE602004005141T2 (fr) |
ES (1) | ES2280005T3 (fr) |
FR (1) | FR2864500A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014202599A1 (de) | 2014-02-13 | 2015-08-13 | Robert Bosch Gmbh | Federeinrichtung für einen Bremskraftverstärker oder einen Hauptbremszylinder eines Bremssystems und Verfahren zum Betreiben eines mit einer Federeinrichtung ausgestatteten Bremskraftverstärkers oder eines mit der Federeinrichtung ausgestatteten Hauptbremszylinders |
DE102021203901A1 (de) | 2021-04-20 | 2022-10-20 | Zf Active Safety Gmbh | Unterdruckbremskraftverstärker |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5063830A (en) * | 1990-03-05 | 1991-11-12 | Jidosha Kiki Co., Ltd. | Brake booster |
EP1028045A1 (fr) * | 1999-02-10 | 2000-08-16 | Nissin Kogyo Co., Ltd. | Appareil générateur de pressur pour véhicles |
-
2003
- 2003-12-24 FR FR0315505A patent/FR2864500A1/fr not_active Withdrawn
-
2004
- 2004-12-13 DE DE602004005141T patent/DE602004005141T2/de active Active
- 2004-12-13 ES ES04029433T patent/ES2280005T3/es active Active
- 2004-12-13 EP EP04029433A patent/EP1547889B1/fr not_active Not-in-force
- 2004-12-13 AT AT04029433T patent/ATE356012T1/de not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5063830A (en) * | 1990-03-05 | 1991-11-12 | Jidosha Kiki Co., Ltd. | Brake booster |
EP1028045A1 (fr) * | 1999-02-10 | 2000-08-16 | Nissin Kogyo Co., Ltd. | Appareil générateur de pressur pour véhicles |
Also Published As
Publication number | Publication date |
---|---|
FR2864500A1 (fr) | 2005-07-01 |
DE602004005141D1 (de) | 2007-04-19 |
ATE356012T1 (de) | 2007-03-15 |
ES2280005T3 (es) | 2007-09-01 |
EP1547889B1 (fr) | 2007-03-07 |
DE602004005141T2 (de) | 2007-11-29 |
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